<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>图片廊</title>
    <style>
        div.img {border: 1px solid #cccccc;}
        div.img:hover {border: 1px solid #777777;}
        div.img img {width: 100%;height: auto;}
        div.desc {padding: 15px;text-align: center;}
        * {box-sizing: border-box;}
        .responsive
        {
            padding: 0 60px;
            float: left;
            width: 24.99999%;
        }
        @media only screen and (max-width: 700px) {
            .responsive
            {
                width: 49.99999%;
                margin: 6px 0;
            }
        }
        @media only screen and (max-width: 500px) {
            .responsive {
                width: 100%;
            }
        }
        .clearfix:after {
            content: "";
            display: table;
            clear: both;
        }
    </style>
</head>
<body>
<h2 style="text-align: center">响应式图片相册</h2>
<div class="responsive">
    <div class="img">
        <a target="_blank" href="img_fjords.jpg">
            <img src="http://www.runoob.com/wp-content/uploads/2016/04/img_fjords.jpg" alt="Trolltunga Norway" width="300" height="200">
        </a>
        <div class="desc">Add a description of the image here</div>
    </div>
</div>
<div class="responsive">
    <div class="img">
        <a target="_blank" href="img_forest.jpg">
            <img src="http://www.runoob.com/wp-content/uploads/2016/04/img_forest.jpg" alt="Forest" width="600" height="400">
        </a>
        <div class="desc">Add a description of the image here</div>
    </div>
</div>
<div class="responsive">
    <div class="img">
        <a target="_blank" href="img_lights.jpg">
            <img src="http://www.runoob.com/wp-content/uploads/2016/04/img_lights.jpg" alt="Northern Lights" width="600" height="400">
        </a>
        <div class="desc">Add a description of the image here</div>
    </div>
</div>

<div class="responsive">
    <div class="img">
        <a target="_blank" href="img_mountains.jpg">
            <img src="http://www.runoob.com/wp-content/uploads/2016/04/img_mountains.jpg" alt="Mountains" width="600" height="400">
        </a>
        <div class="desc">Add a description of the image here</div>
    </div>
</div>

<div class="clearfix"></div>

<div style="padding:6px;">

    <h4>重置浏览器大小查看效果</h4>
</div>
</body>
</html>